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  Measurement, Test and Calibration
  Test instrument backlash

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Author Topic:   Test instrument backlash
posted 25 April 2001 02:54 PM           Edit/Delete Message   Reply w/Quote
There is a debate underway as to how we evaluate/measure backlash on an optical comparator. Currently, with an inspection master, we check for linearity at each inch traversing the table in both directions. The difference of the reading from one direction to the other is reported as backlash. Is this the correct way to measure backlash?

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Ryan Wilde
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From:Mineola, NY, USA
Registered: Feb 2001

posted 25 April 2001 04:59 PM     Click Here to See the Profile for Ryan Wilde   Click Here to Email Ryan Wilde     Edit/Delete Message   Reply w/Quote
I am unclear as to whether you are referencing the measurements from the same position or not. Backlash is generally considered the error at the same point when taking ascending and decending readings. The easiest method is to go directly to whatever point you are measuring, document the measurement, and then immediately take a measurement at the same point in the opposite direction, referenced to the same point.


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